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Double Stack Magnet Rated at 900 Watts RMS 92dB Efficiency Frequency Response of 28Hz to 500Hz Dual 4 ohm 2 1/2” Voice Coils 8-Gauge Sure-Lok Input and Output Terminals (Patent Pending) Mounting Dimensions — Depth: 168mm / 6 5/8” Through Hole: 275mm / 10 7/8” Diameter: 312mm / 12 5/16 PSW815E 15” ALPHA 800 SERIES SUBWOOFER Proprietary Cast Aluminum Alloy Machine Cut “Alpha” Basket Proprietary Cooling Rings for Motor Assembly (Patent Pending) Kevlar® Reinforced Composite Balanced & Laminated Cone High Tensile Strength Two-Layer Surround for Enhanced Control Flat Progressive Rate Nomex® Damper w/ Spiral-Woven Leads 150 oz. Double Stack Magnet Rated at 1000 Watts RMS 94dB Efficiency Frequency Response of 24Hz to 500Hz Dual 4 ohm 3 “ Voice Coils 8-Gauge Sure-Lok Input and Output Terminals (Patent Pending) Mounting Dimensions — Depth: 201mm / 8” Through Hole: 351mm / 13 7/8” Diameter: 388mm / 15 1/16” Now that you know about subwoofer specifications it’s time to learn about building subwoofer boxes. If you’ve done any woodworking you shouldn’t have much trouble when building a subwoofer enclosure. One of the main differences will probably be the material used in building subwoofer boxes as compared to other woodworking projects. When building a custom subwoofer box you will want to use minimal MDF (medium density fiberboard). TOOLS REQUIRED TO BUILD AN ENCLOSURE Safety goggles Table saw or circular saw Powered screw gun Router or jig saw Variety of sizes of drill bits Wood glue Silicone Wood screws To ensure your safety while building an enclosure, please read all manuals for the power tools you will be using, as they will include valuable information on handling the tools and safety tips. BUILDING AN ENCLOSURE B U I L D I N G A N E N C L O S U R E 7 B U I L D I N G A N E N C L O S U R E 7 If you’re planning to build your own enclosure and are confused in what type of enclosure best suits your needs this page will help you choose what enclosure fits your needs. There are many different types of enclosures. The two most common used enclosures are sealed and vented enclosure. This page will show the advantages and disadvantages of the two enclosures. Advantages of a sealed enclosures *High power handing capability *Great transient response *Tolerant of minor enclosure size variation *Easy to construct *Smooth rolloff (12dB/octave) Disadvantages of a sealed enclosures *Requires a woofer with a long excursion for better low bass frequency response. *Can have lower sensitivity than ported enclosures. *When using high power and small enclosures, the woofer is not in an ideal cooling environment. *Less low bass as compared to a properly tuned vented enclosure above the ported tuning frequency. Advantages of a vented enclosure *Increased output around vented tuning *Higher power handling above the port tuning frequency *Extended frequency response *Magnet is in a good cooling environment *Handles higher bass frequencies with less distortion Disadvantages of a vented enclosure *Vented enclosure transient response is not as good as sealed boxes because of the resonant effect of the vent tuning *Midrange sound coming from inside the enclosure through the vent can produce unpleasant sound coloration. *Loss of cone movement control below vent tuning, which can result in high distortion and mechanical failure of the driver. *Lower power handling below the port tuning frequency. Calculating speaker enclosure volume is a five step procedure. (Make sure you do not forget to subtract the thickness of the wood that you have selected to use to build your enclosure.) Step One: Measure Height Step Two: Measure Width Step Three: Measure Depth Step Four: Height x Width x Depth Step Five: Divide the results were in step four by 1728 (12" x 12" x 12"=1728 which equals to 1.0 cu ft.) Complete formula should look like this Height x Width x Depth / 1728 =__________ Below are illustrated versions of all the steps that you should take. (FOR EXAMPLE ONLY) BUILDING AN ENCLOSURE Step One Step Three Side View 12" 13.5" 13.5-1.5=12 Patent No: US D478,556 S Patent No: US 6,601,645 B1 Patent No: US 6,656,000 B2 19.5" 12" 18" Step Two 13.5-1.5+12 13.5" The wood that we are using is 0.75" thick The 1.5 that you see in the formula is the thickness of the wood. Calculating thickness of wood: Measure how thick the wood is then multiply by two. The reason that you are multiplying by two is each side of the enclosure. Left + Right=1.5 Top + Bottom=1.5 Front + Back=1.5 .75 x 2=1.50 18 x 12 x 12=2592 2592 / 1728=1.5 1.5 cu. ft. is the results for this enclosure B U I L D I N G A N E N C L O S U R E 9 B U I L D I N G A N E N C L O S U R E 9 Calculating speaker enclosure volume is a five step procedure. (Make sure you do not forget to subtract the thickness of the wood and port displacement that you used.) Step One: Measure Height Step Two: Measure Width Step Three: Measure Depth Step Four: Height x Width x Depth Step Five: Divide the results in step four by 1...

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